Grating safety cover and a production method for the same

ABSTRACT

A method for manufacturing a grating safety cover includes forming a perforated plate through which a plurality of holes vertically pass, inserting, respectively into the holes, half-conical pillars each having a smaller diameter than that of each of the holes such that the outer circumferential surfaces of the half-conical pillars are separated from the inner circumferential surfaces of the holes, forming an upper layer by applying an elastic material onto the perforated plate in which the half-conical pillars are inserted, and separating the half-conical pillars. According to the grating safety cover, drainage is well performed and a heel, a stroller wheel, or the like is prevented from easily falling into the safety grating. Further, due to shock absorption of the elastic layer, the safety grating has excellent durability and is not easily damaged.

TECHNICAL FIELD

The present disclosure relates to a safety grating having good drainage and preventing a heel, a stroller wheel, or the like from easily falling thereinto.

BACKGROUND ART

A grating, which is a panel with a lattice of cast-iron bars, covers a manhole or drain so that storm water or wastewater falls thereinto but a person or a thing does not falls thereinto. A typical grating has a problem in that a heel, a stroller wheel, or the like falls into the space of the lattice. To overcome this problem, various grating safety covers have been proposed.

However, according to a typical grating safety cover illustrated in FIG. 1, a lower plate 10′ is formed, an upper plate 20′ of the lower plate 10′ is formed, and then the lower plate 10′ and upper plate 20′ are overall perforated to have a plurality of holes 30′. Accordingly, the typical grating safety cover has a cross section as illustrated in FIG. 2.

However, according to the typical grating safety cover, the holes are vertically formed, and are thus easily blocked with dirt or soil. In the case of increasing the sizes of the holes to prevent this problem, the problem of falling of a heel, a stroller wheel, or the like may not be solved.

DISCLOSURE OF THE INVENTION Technical Problem

Embodiments provide a grating safety cover having good drainage and preventing a heel, a stroller wheel, or the like from easily falling thereinto.

Technical Solution

In one embodiment, a method for manufacturing a grating safety cover includes: forming a perforated plate through which a plurality of holes vertically pass; inserting, respectively into the holes, half-conical pillars each having a smaller diameter than that of each of the holes such that the outer circumferential surfaces of the half-conical pillars are separated from the inner circumferential surfaces of the holes; forming an upper layer by applying an elastic material onto the perforated plate in which the half-conical pillars are inserted; and separating the half-conical pillars.

The half-conical pillars may be fixed to a pillar-fixing plate while being inserted into the holes.

The perforated plate may include poly carbonate.

The upper layer may include urethane.

The forming of the upper layer may include covering the upper layer with a grating safety cover molding plate, and separating the grating safety cover molding plate.

Advantageous Effects

Since a water discharge hole of a safety grating is shaped like a half cone and an elastic layer is formed on an upper surface of the safety grating, drainage is well performed and a heel, a stroller wheel, or the like is prevented from easily falling into the safety grating. Further, due to shock absorption of the elastic layer, the safety grating has excellent durability and is not easily damaged.

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1 and 2 illustrate a grating safety cover according to the related art.

FIGS. 3 to 6 illustrate a manufacturing process of a grating safety cover according to an embodiment.

FIG. 7 illustrates a half-conical pillar used for the grating safety cover according to the embodiment.

FIG. 8 illustrates a cross section of the grating safety cover according to the embodiment.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The following description is just an example for helping understanding of the embodiments, and the technical concept is not limited thereto and may be variously modified by those skilled in the art.

FIGS. 3 to 6 are diagrams for explaining a method for manufacturing a grating safety cover according to an embodiment.

As illustrated in FIG. 3, a perforated plate 10 is formed. It is preferable that the perforated plate 10 is formed of a material that is so strong as to support the weight of a person, e.g., poly carbonate or carbon fiber. To form the perforated plate 10, holes 30 are formed in a plate made of the material at a regular interval.

As illustrated in FIG. 4, a half-conical pillar 41 having a little bit smaller diameter than that of the hole 30 is inserted into the perforated plate 10. Since the diameter of the half-conical pillar 41 is smaller than that of the hole 30, a space is formed between the half-conical pillar 41 and the hole 30. Herein, as illustrated in FIG. 5, it is preferable that the outer circumferential surface of the half-conical pillar 41 is completely separated from the inner circumferential surface of the hole 30.

The half-conical pillar 41 protrudes from a pillar-fixing plate 40. A bolt 42 is formed under the half-conical pillar 41, and a hole to which the bolt 42 is inserted is formed in the pillar-fixing plate 40 so that the half-conical pillar 41 is fit and fixed to the pillar-fixing plate 40.

After the half-conical pillar 41 is inserted into the hole 30, an elastic material such as urethane resin is applied onto the perforated plate 10 to thereby form an upper layer 20 as illustrated in FIG. 6. Herein, the height of the upper layer 20 is the same as that of the half-conical pillar 41, and when the elastic material is applied, the space between the half-conical pillar 41 and the hole 30 is filled with the elastic material.

Therefore, when the pillar-fixing plate 40 is detached, the grating safety cover according to the embodiment is formed.

Additionally, in order to form the upper layer 20 by applying the upper layer-forming material onto the perforated plate 10 in which the half-conical pillar 41 is inserted, a grating safety cover molding plate 50 may cover the upper layer 20.

Thereafter, the grating safety cover molding plate 50 may be removed. Thereafter, when the pillar-fixing plate 40 is separated from the grating safety cover molding plate 50, the grating safety cover according to the embodiment is formed.

According to the above-manufactured grating safety cover, since the upper layer 20 is such formed as to surround the perforated plate 10, and particularly, a half-conical hole 70 is formed, dirt or the like inserted into the hole instantly passes through the hole without blocking the hole by virtue of the structural characteristic of the hole having a diameter increasing in a direction toward a lower part thereof. Further, since the upper layer 20 is formed of the elastic material such as the urethane, the grating safety cover is not easily damaged, and moreover facilitates discharge of the dirt by virtue of elastic force caused by a walking person or passing thing.

MODE FOR CARRYING OUT THE INVENTION

In the present embodiment, for the perforated plate, holes each having a diameter of about 15 mm are formed, at an interval of 20 pitches, in a poly carbonate plate having a size of about 390 mm×985 mm.

An iron plate having a size of about 400 mm×1,000 mm is used for the pillar-fixing plate. Half-conical pillars each having a bottom diameter of about 14 mm, a top diameter of about 7 mm, and a height of about 7 mm are fixed onto this plate at an interval of 20 pitches.

An iron plate having a size of about 400 mm×1,000 mm and having a wall with a height of about 9 mm on the edge thereof is used for the grating safety cover molding plate.

The half-conical pillars of the pillar-fixing plate are inserted into the holes of the perforated plate, and a pin or the like is used for fixing the perforated plate.

A valley molding frame 51 is embossed on the bottom of the grating safety cover molding plate so as to form a valley on the upper surface of the grating safety cover. It is preferable to dispose the half-conical pillars on the embossed valley molding frame. Accordingly, when the grating safety cover molding plate is removed, a hole is disposed in the valley, and thus drainage is easily performed.

The perforated plate fixed to the pillar-fixing plate is arranged on the grating safety cover molding plate. Since the perforated plate has a smaller size than that of the grating safety cover molding plate, the perforated plate may be inserted into a space within the wall formed on the edge of the grating safety cover molding plate. In this state, an urethane resin liquid is injected. The urethane resin liquid is injected to the inner space between the grating safety cover molding plate and the pillar-fixing plate, and accordingly fills the holes of the perforated plate and overall surrounds the perforated plate.

When the urethane resin liquid is hardened, the pillar-fixing plate is removed from the grating safety cover, and a curing process is performed. By performing a finishing molding process, the grating safety cover is completed.

INDUSTRIAL APPLICABILITY

The present disclosure relates to a safety grating having good drainage and preventing a heel, a stroller wheel, or the like from easily falling thereinto. 

1. A method for manufacturing a grating safety cover covering a grating, the method comprising: forming a perforated plate through which a plurality of holes vertically pass; inserting, respectively into the holes, half-conical pillars each having a smaller diameter than that of each of the holes such that the outer circumferential surfaces of the half-conical pillars are separated from the inner circumferential surfaces of the holes; forming an upper layer by applying an elastic material onto the perforated plate in which the half-conical pillars are inserted; and separating the half-conical pillars.
 2. The method according to claim 1, wherein the half-conical pillars are fixed to a pillar-fixing plate while being inserted into the holes.
 3. The method according to claim 1, wherein the perforated plate comprises a plate formed of poly carbonate or carbon fiber.
 4. The method according to claim 1, wherein the upper layer comprises urethane.
 5. The method of claim 1, wherein the forming of the upper layer comprises: covering the upper layer with a grating safety cover molding plate; and separating the grating safety cover molding plate.
 6. A grating safety cover manufactured according to the method of claim
 1. 7. A grating safety cover manufactured according to the method of claim
 2. 8. A grating safety cover manufactured according to the method of claim
 3. 9. A grating safety cover manufactured according to the method of claim
 4. 10. A grating safety cover manufactured according to the method of claim
 5. 11. A grating safety cover, comprising: a perforated plate through which a plurality of holes vertically pass; and an upper layer through which a plurality of half-conical holes vertically pass, the upper layer placed on an upper surface of the perforated plate with a predetermined thickness, wherein vertical centers of the half-conical holes are aligned with vertical centers of the plurality holes of the perforated plate.
 12. The grating safety cover according to claim 11, wherein lowermost parts of the half-conical holes and lowermost parts of the holes of the perforated plate are coplanar.
 13. The grating safety cover according to claim 12, wherein the lowermost parts of the half-conical holes has diameters smaller than diameters of the lowermost parts of the perforated plate.
 14. The grating safety cover according to claim 13, wherein uppermost parts of the half-conical holes has diameters smaller than diameters of uppermost parts of the half-conical holes.
 15. The grating safety cover according to claim 11, wherein the upper layer is formed of an elastic material including urethane.
 16. The grating safety cover according to claim 11, wherein the perforated plate is formed of a rigid material including poly carbonate or carbon fiber.
 17. The grating safety cover according to claim 11, wherein the upper layer has a valley on an upper surface thereof, wherein the valley is configured to be recessed a predetermined depth from the upper surface of the upper layer. 